I'm using an A-Designs Pacifica (two channel mic pre) with the VS700.  It's connected to the VS via a Mytek A/D then to the VS via AES.  I'm also using a UA LA610 and a Presonus RC500 into a RME MultiFaceII and then into the VS via ADAT.  I don't use the mic pres a lot on the VS but they aren't bad at all.